I listened to Maria Taylor just last night actually and she was really good, I'll check out the bands that she is in though.
I'm having trouble finding Joanna, I found this
www.myspace.com/joannanewsommm and if that is her then it's great, sounds like a folky Yeah Yeah Yeahs (her voice atleast).
Mary Lou is the ****, that's all I can say about that one.